Wireless Access

Hi all,

thank you in advance for your help.

We have a warehouse with Aruba AOS-10 APs (most of  them are AP-505)

version 10.4.1.7
SSID in bridge mode, WPA2-Personal, 
we have Zebra TC22 (2 devices) and Zebra MC930P (>5 devices)
clients have static IP
users work in the same place, they do not move while they are using the Zebra computer
clients and server are in the same subnet

We are using Zebra TC22 and Zebra MC930Pto scan barcodes

Zebra MC930P work fine
Zebra TC22 occasionally (30% of the using) get slow connection for about 2-3 minutes (all of the Zebra TC22 have the same behavior)
The slow connection last about 2-3 minutes, than the behavior gets normal doing nothing

Any idea or same experience with this devices ?

Thank you all

this is often device issue, some of them depending on their setting/firmware version have a few goes to get connected when one trims the basic rates (as an example) 

have you double checked the settings and the firmware version? do you have all the channels enabled on the TC22s? Are they managed by MDM ?

Hi all,

thank you in advance for your help.

We have a warehouse with Aruba AOS-10 APs (most of  them are AP-505)

version 10.4.1.7
SSID in bridge mode, WPA2-Personal, 
we have Zebra TC22 (2 devices) and Zebra MC930P (>5 devices)
clients have static IP
users work in the same place, they do not move while they are using the Zebra computer
clients and server are in the same subnet

We are using Zebra TC22 and Zebra MC930Pto scan barcodes

Zebra MC930P work fine
Zebra TC22 occasionally (30% of the using) get slow connection for about 2-3 minutes (all of the Zebra TC22 have the same behavior)
The slow connection last about 2-3 minutes, than the behavior gets normal doing nothing

Any idea or same experience with this devices ?

Thank you all

Hi all,

thank you in advance for your help.

We have a warehouse with Aruba AOS-10 APs (most of  them are AP-505)

version 10.4.1.7
SSID in bridge mode, WPA2-Personal, 
we have Zebra TC22 (2 devices) and Zebra MC930P (>5 devices)
clients have static IP
users work in the same place, they do not move while they are using the Zebra computer
clients and server are in the same subnet

We are using Zebra TC22 and Zebra MC930Pto scan barcodes

Zebra MC930P work fine
Zebra TC22 occasionally (30% of the using) get slow connection for about 2-3 minutes (all of the Zebra TC22 have the same behavior)
The slow connection last about 2-3 minutes, than the behavior gets normal doing nothing

Any idea or same experience with this devices ?

Thank you all

Second Ariyap's statement on data rates, include the defaults and ensure consistency. 

Zebra TC21 and others have been documented on the Interop website:

https://www.hpe.com/psnow/doc/a50011947enw

TC22 - I'd be curious about retry rates - given a good solid SNR connection to an AP that offers a good channel, what are the retry rates ?

If only the TC22 devices show abnormally high retry rates, particularly receiving from the AP, 

Also power saving, experiences with TC21 - WMM U-APSD can be less than optimal.

One test is to ping to/from the TC22 from the wired network - if using windows, ensure the ICMP timeout is 3 seconds (not the default 1 second) watch for a pattern

of frame latency - example 3-4 continuous seconds of very latent responses (could well be power save) , or perhaps 1-2 seconds of latency every 10 seconds or so, this with the retry rates would help determine what might be going wrong.

Hi all,

thank you in advance for your help.

We have a warehouse with Aruba AOS-10 APs (most of  them are AP-505)

version 10.4.1.7
SSID in bridge mode, WPA2-Personal, 
we have Zebra TC22 (2 devices) and Zebra MC930P (>5 devices)
clients have static IP
users work in the same place, they do not move while they are using the Zebra computer
clients and server are in the same subnet

We are using Zebra TC22 and Zebra MC930Pto scan barcodes

Zebra MC930P work fine
Zebra TC22 occasionally (30% of the using) get slow connection for about 2-3 minutes (all of the Zebra TC22 have the same behavior)
The slow connection last about 2-3 minutes, than the behavior gets normal doing nothing

Any idea or same experience with this devices ?

Thank you all

Hi Sadams,

your indications are interestings.

I have found WMM U-APSD enable in my Central WLAN configuration. I'll do a test with WMM U-APSD disabled.

SNR and retry rates seen from Central are good.

Instead I have events of High Drops, what does it mean ?

Second Ariyap's statement on data rates, include the defaults and ensure consistency. 

Zebra TC21 and others have been documented on the Interop website:

https://www.hpe.com/psnow/doc/a50011947enw

TC22 - I'd be curious about retry rates - given a good solid SNR connection to an AP that offers a good channel, what are the retry rates ?

If only the TC22 devices show abnormally high retry rates, particularly receiving from the AP, 

Also power saving, experiences with TC21 - WMM U-APSD can be less than optimal.

One test is to ping to/from the TC22 from the wired network - if using windows, ensure the ICMP timeout is 3 seconds (not the default 1 second) watch for a pattern

of frame latency - example 3-4 continuous seconds of very latent responses (could well be power save) , or perhaps 1-2 seconds of latency every 10 seconds or so, this with the retry rates would help determine what might be going wrong.

Hi all,

thank you in advance for your help.

We have a warehouse with Aruba AOS-10 APs (most of  them are AP-505)

version 10.4.1.7
SSID in bridge mode, WPA2-Personal, 
we have Zebra TC22 (2 devices) and Zebra MC930P (>5 devices)
clients have static IP
users work in the same place, they do not move while they are using the Zebra computer
clients and server are in the same subnet

We are using Zebra TC22 and Zebra MC930Pto scan barcodes

Zebra MC930P work fine
Zebra TC22 occasionally (30% of the using) get slow connection for about 2-3 minutes (all of the Zebra TC22 have the same behavior)
The slow connection last about 2-3 minutes, than the behavior gets normal doing nothing

Any idea or same experience with this devices ?

Thank you all

Drops of course refer to frames dropped, which is interesting given the great SNR, and low retry rates. If that number is accurate, a) horrible service b) very odd, indicates

the drops are not due to retries. 

One might look in more detail at the client and radio statistics to confirm drops/retries/data rates used. 

show ap arm rf-sum

show ap debug radio-stats 0   (where 0 is the 5Ghz radio, 1 2.4Ghz, 2 6Ghz)

show ap debug client-stats <STA MAC> <BSSID>

Hi Sadams,

your indications are interestings.

I have found WMM U-APSD enable in my Central WLAN configuration. I'll do a test with WMM U-APSD disabled.

SNR and retry rates seen from Central are good.

Instead I have events of High Drops, what does it mean ?

Second Ariyap's statement on data rates, include the defaults and ensure consistency. 

Zebra TC21 and others have been documented on the Interop website:

https://www.hpe.com/psnow/doc/a50011947enw

TC22 - I'd be curious about retry rates - given a good solid SNR connection to an AP that offers a good channel, what are the retry rates ?

If only the TC22 devices show abnormally high retry rates, particularly receiving from the AP, 

Also power saving, experiences with TC21 - WMM U-APSD can be less than optimal.

One test is to ping to/from the TC22 from the wired network - if using windows, ensure the ICMP timeout is 3 seconds (not the default 1 second) watch for a pattern

of frame latency - example 3-4 continuous seconds of very latent responses (could well be power save) , or perhaps 1-2 seconds of latency every 10 seconds or so, this with the retry rates would help determine what might be going wrong.

Hi all,

thank you in advance for your help.

We have a warehouse with Aruba AOS-10 APs (most of  them are AP-505)

version 10.4.1.7
SSID in bridge mode, WPA2-Personal, 
we have Zebra TC22 (2 devices) and Zebra MC930P (>5 devices)
clients have static IP
users work in the same place, they do not move while they are using the Zebra computer
clients and server are in the same subnet

We are using Zebra TC22 and Zebra MC930Pto scan barcodes

Zebra MC930P work fine
Zebra TC22 occasionally (30% of the using) get slow connection for about 2-3 minutes (all of the Zebra TC22 have the same behavior)
The slow connection last about 2-3 minutes, than the behavior gets normal doing nothing

Any idea or same experience with this devices ?

Thank you all

@sadams very useful debug indications.

@ariyap in the mean time Zebra told me to upgrade

Thank you

I'll investigate and do more tests.

Drops of course refer to frames dropped, which is interesting given the great SNR, and low retry rates. If that number is accurate, a) horrible service b) very odd, indicates

the drops are not due to retries. 

One might look in more detail at the client and radio statistics to confirm drops/retries/data rates used. 

show ap arm rf-sum

show ap debug radio-stats 0   (where 0 is the 5Ghz radio, 1 2.4Ghz, 2 6Ghz)

show ap debug client-stats <STA MAC> <BSSID>

Hi Sadams,

your indications are interestings.

I have found WMM U-APSD enable in my Central WLAN configuration. I'll do a test with WMM U-APSD disabled.

SNR and retry rates seen from Central are good.

Instead I have events of High Drops, what does it mean ?

Second Ariyap's statement on data rates, include the defaults and ensure consistency. 

Zebra TC21 and others have been documented on the Interop website:

https://www.hpe.com/psnow/doc/a50011947enw

TC22 - I'd be curious about retry rates - given a good solid SNR connection to an AP that offers a good channel, what are the retry rates ?

If only the TC22 devices show abnormally high retry rates, particularly receiving from the AP, 

Also power saving, experiences with TC21 - WMM U-APSD can be less than optimal.

One test is to ping to/from the TC22 from the wired network - if using windows, ensure the ICMP timeout is 3 seconds (not the default 1 second) watch for a pattern

of frame latency - example 3-4 continuous seconds of very latent responses (could well be power save) , or perhaps 1-2 seconds of latency every 10 seconds or so, this with the retry rates would help determine what might be going wrong.

Hi all,

thank you in advance for your help.

We have a warehouse with Aruba AOS-10 APs (most of  them are AP-505)

version 10.4.1.7
SSID in bridge mode, WPA2-Personal, 
we have Zebra TC22 (2 devices) and Zebra MC930P (>5 devices)
clients have static IP
users work in the same place, they do not move while they are using the Zebra computer
clients and server are in the same subnet

We are using Zebra TC22 and Zebra MC930Pto scan barcodes

Zebra MC930P work fine
Zebra TC22 occasionally (30% of the using) get slow connection for about 2-3 minutes (all of the Zebra TC22 have the same behavior)
The slow connection last about 2-3 minutes, than the behavior gets normal doing nothing

Any idea or same experience with this devices ?

Thank you all